Self-Assembled Dichroic Plasmonic Nitride Nanostructures with Broken Centrosymmetry for Second Harmonic Generation
Résumé
TiN and ZrN are emerging as important alternative plasmonic materials. In
addition to their well-known assets, they can incorporate point defects that break the
centrosymmetry of their cubic crystal structure, making them promising candidates as
non-linear optical materials and especially for second harmonic generation (SHG). Their
refractory character and chemical stability were obstacles for the bottom-up fabrication of
TiN and ZrN nanostructures so far. In this work, it is shown that highly directional
dichroic nanostructures of TiN and ZrN may be indeed grown by self-assembly using
glancing angle deposition on periodic rippled dielectric surfaces. The produced nitride
nanostructures exhibit point defects and exceptional photothermal durability. These
nanostructures exhibit strong SHG response when probed by a near-infrared laser. It is
shown that SHG is strongly associated with the near-field enhancement due to the
localized surface plasmon resonance of the nanostructures. Given that such
nanostructures can endure extremely high electric fields, they are expected to be able to
emit massive SHG signals and be applied in laser technology as optical components such
as polarizers and SHG emitters.
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